As I have never
seen anything like this, it's hard to give constructive critisism.
First. It's amazing. Amazing.
Personally, I think Ed's forehead is too big, but that can be the first anime's style, and I'm not really familiar with that anymore. Same with his colours.
I love the leather-pants and the pocket watch-chain. And as Edamame
said, the scars and the textue of his automail is amazing! I love his grin, too, but (depending on what style you're going for) maybe you should have some more shadows in his eyes, around the outer edge.
As I understand you're not finished(?). That would explain the coat.
It needs shadows and folds and stuff! But I looked at that site and I see the coloured picture from above/the side has more details on it!
His bangs have some small horisontal ripples, I think, it could be the quality of the picture...
Al. Wow, that's amazing! I especially love his eyes! He is very clean here! I can't think of anything to say...He is perfect. *really, really trying to have some good advice*...Maybe all the scratches shouldn't be completely straight?!....(lol, meaningless detail...)